Hyperloop is a mode of transportation that propels a pod-like vehicle through a near-vacuum tube at more than airline speed. The pods would accelerate to cruising speed gradually using a linear electric motor and glide above their track using passive magnetic levitation or air bearings. The tubes could also go above ground on columns or underground, eliminating the dangers of grade crossings. Hyperloop is a highly energy-efficient, quiet and autonomous way to travel.Source: https://en.wikipedia.org/wiki/Hyperloop